Posts Tagged ‘Exercise’

Less Hippocampus, More Caudate Nucleus

January 24, 2020

This post is based on text from Wayfinding, a book by M.R. O’Connor.
Bohbot is concerned that the conditions of modern Life are leading us to flex the hippocampus less while spurring us to rely on the caudate nucleus. She says, “Maybe in the past we never had to go on autopilot. Having jobs in one location and lives being more habitual is new. Industrialization learned to capitalize on the habit-memory-learning system.” HM is in strong agreement with Dr. Bohbot.

Chronic stress, untreated depression, insomnia, and alcohol abuse all can shrink hippocampal volume. Anxiety alone has been shown to impact the spatial learning and memory of rats. Stress and depression seem to affect neurogenesis in the hippocampus, whereas exercise seems to improve learning, memory and resistance to depression, which spurs a proliferation of new neurons. Patients with PTSD have been shown to have lower hippocampal volume. One of the consequences of effective treatment for this disorder such as the use of antidepressants and changes in environment, is increased hippocampal volume.

Bohbot has been led by the widespread prevalence of these conditions to be concerned that by the time children enter young adulthood, they might already have relatively shrunken hippocampal volume that makes them susceptible to cognitive and emotional impairments and behavioral problems. An over reliance on stimulus-response navigation strategies seems connected to a host of destructive yet seemingly unrelated behaviors. Because the circuit is located in the striatum, a brain area involved in addiction, Bohbot started to wonder: Would people who rely on a response strategy to navigate show any difference in substance abuse from those who relied on spatial strategies? In 2013 she published a study of 55 young adults that showed those who relied on response strategies in navigating had double the amount of lifetime alcohol consumption, in addition to more use of cigarettes and marijuana. In a different study of 255 children, she found that those with ADHD symptoms primarily rely on caudate nucleus stimulus strategies. Recently, Bohbot and Greg West showed that ninety hours of in-lab action video games will shrink the hippocampus of young adults who used their caudate nucleus. This is the first clear evidence that the activities we engage in can have negative impact on the hippocampus.

In 2017, Bohbot along with ten researchers published a report called, “Global Determinants of Navigational Ability,’ in which they looked at the performance of 2.5 million people globally on a virtual spatial navigation task. Then they broke the data down to understand whether there were similar profiles in cognitive abilities among countries. The data are that spatial navigation ability starts declining in early adulthood, around nineteen years of age, and steadily slips in old age. People from rural ares were significantly better at the game. When it came to countries themselves, Australians, South Africans, and North American showed generally good spatial orientation skills, but the real outliers were Nordic countries.

Passing 71

May 6, 2017

Meaning that today I am entering my 72nd year.  Time appears to be flying by at an increasingly faster rate.  Unfortunately, this is the best time of my life, so I really wish it were not flying by so fast.  When I retired I told people that it was the happiest time of my life since I was five years old.  I am eternally grateful to my parents for keeping me out of organized activities until I entered school in the first grade.  But from then on, I was continuously occupied with education, the military, more education, and then professional activities.

Now I am a free man.  I sleep until I wake up and find that my time is my own.  If I did not have growth activities, along with meditation, exercise, and a healthy diet, dementia would likely be setting it.  But I stay cognitively active.  I do a great deal of reading and some writing.  Unfortunately, there is not enough time to read all the interesting and important things to read.  I do indeed have a growth mindset.

I also do a great deal of walking, much of it with my wife.  And at times I do engage in the walking meditations in nature I wrote about in the preceding post.

I stay in touch with friends.

I meditate daily; sometimes several times a day.  And I tend to slip into a meditative state when I am forced to wait.  I try to spend as much time as I can fostering a healthy memory.

In a couple of weeks I’ll be attending the annual meeting of the Association for Psychological Science in Boston.  Shortly after we return we’ll be off again on a tour of National Parks.  In August we’ll be taking a cruise out of Amsterdam, with port calls in Scotland, Norway, and Iceland.  This is an Insight Cruise with lectures in physics and anthropology.

I engage in ikigai, the Japanese term for the activities in Victor Stretcher’s book, “Life on Purpose.”  My purpose, in addition to living a fulfilling life with my wife, is to learn and share my thoughts and knowledge with others.  That is the purpose of this blog, and at some time in the future a book or books might be in the offing.

© Douglas Griffith and, 2017. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Douglas Griffith and with appropriate and specific direction to the original content.

How to Develop a Healthy Memory

December 22, 2015

I get the sense that many who read the healthy memory blog are disappointed that advice is not provided on exactly what to do for a healthy memory.   If a vaccine to either prevent or cure Alzheimer’s and dementia is not in the offing, what specifically should they do.  Is there a diet that will save them?  Will physical exercise suffice, and if so, how much?  What online games do they need to play or what specific cognitive exercises need to be done and for how long?

Hints to some of these question can be found, but no definitive answers.  The reason that no definitive answers can be found is that there are no definitive answers.  The two big themes of this blog are to develop growth mindsets and to practice meditation.  Although diet and physical exercise do play a role, growth mindsets and meditation are key in my view.  The healthy memory blog presents many ideas as to how to pursue growth mindsets and meditation, as well as posts that are provided to help one think about different ideas.

No guarantees can be provided that dementia cannot be prevented.  But I strongly believe that not only reading, but pursuing some of the ideas in the healthy memory blog will greatly reduce one’s risks.  They also provide some guidance on leading a more satisfactory life.  Accordingly, the healthy memory blog should be of interest to people of all ages.

© Douglas Griffith and, 2015. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Douglas Griffith and with appropriate and specific direction to the original content.

Six Tips for Improving Your Memory

November 4, 2012

These tips were taken from an article, “Master Your Memory,” in the New Scientist.1

      1. Hit the Sweet Spot. The sweet spot referred to here is the most effective means of remembering information that you want to remember. This topic is covered quite thoroughly in the Healthymemory Blog (see the category on mnemonic techniques). In addition to specific mnemonic techniques, it is good to space the study of material rather than cramming. Also important is testing yourself (see the Healthymemory Blog posts, “The Benefits of Testing,” “To Get It Right, Get It Wrong First!,” and “Trying to Recall Benefits a Healthy Memory.”). I’ve thought that the difference between students who get As and Bs, and students who get Cs, Ds, and Fs, is that the former recall the highlighted portions of their texts whereas the latter simply read them.
      2. Limber up. A bit of exercise can offer immediate benefits to anyone trying to learn new material. Exercise seems to increase mental alertness. One study found that students taking a 10-minute walk found it much easier to learn of list of 30 nouns when compared to a group who just sat around. Short, intense bursts of exercise appear to be more effective. In one experiment students learning a new vocabulary performed better if they studied after two 3-minute runs as compared to a 40-minute gentle jog. They believe that the exercise encouraged the release of neurotransmitters involved in forming new connections among brain cells.
      3. Make a gesture. It is easier to learn abstract concepts if they can be related to simple physical sensations. A variety of experiments have found that acting out an idea with relevant hand gestures can improve later recall, whether the subject is the new vocabulary of a foreign language or the rules of physics.
      4. Engage your nose. The French novelist Marcel Proust could write pages inspired by a remembered odor. Reminiscing about the good old days and recalling whole events from our past has been linked to a raft of benefits and can combat loneliness and feelings of angst. One way to assist in releasing these memories is by using odors. Andy Warhol used to keep an organized library of perfumes, each associated with a specific period of his life. Sniffing particular bottle would bring back a flood of memories associated with that odor. Research has supported the validity of Warhol’s approach for others. Odors do tend to trigger particular emotional memories such as the excitement of a birthday. They are also good at retrieving childhood memories.
      5. Oil the cogs. Diet can be helpful, and I think you can anticipate what is going to follow. Avoid high-sugar fast foods that seem to encourage the build-up of protein plaques characteristic of Alzheimer’s disease. Now diets full of flavonoids (see the Healthymemory Blog posts, “Flavonoids for a Healthy Memory,” and “31 Ways to Get Smarter in 2012”) are good for us. Flavonoids are found in blueberries, strawberries, and omega-3 fatty acids. These are found in oily fish and olive oil. They seem to stave off cognitive decline by a few years as a result of the antioxidants protecting the brain cells from an early death perhaps.
      6. Learn to forget (or rather how not to remember). There might be ways of stopping fresh memories of painful events from being consolidated into long term storage. One study asked participants to watch a disturbing video before asking them to engage in various activities. Participants who played the video game Tetris experienced fewer flash backs to the disturbing as compared to the participants who took the general knowledge quiz. It is thought that the game made greater demands on attentional resources that reduced the processing of the disturbing film. Playing relaxing music after an event that you would rather forget also seems to help. Perhaps it takes the sting out of the negative feelings that cause these events to stick in our minds.

1Jarret, C. (2012). Master Your Memory. New Scientist, 6 October, p. 42-43.

© Douglas Griffith and, 2012. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Douglas Griffith and with appropriate and specific direction to the original content.